Attachment device



FIG. 1 is a perspective view of an attachment device showing the design;

FIG. 2 is a left side elevational view of the attachment device of FIG. 1;

FIG. 3 is a right side elevational view of the attachment device of FIG. 1;

FIG. 4 is a top plan view of the attachment device of FIG. 1;

FIG. 5 is a bottom plan view of the attachment device of FIG. 1;

FIG. 6 is a back elevational view of the attachment device of FIG. 1; and,

FIG. 7 is a front elevational view of the attachment device of FIG. 1.

The dash-dash broken lines showing environment in the drawings are included for illustrative purposes only and form no part of the claimed design. The dot-dash-dot broken lines shown in the drawings define the boundaries of the claim and form no part thereof. 

CLAIM The ornamental design for an attachment device, as shown and described. 